diff --git a/package-lock.json b/package-lock.json
index e7b462be63..82b46b24bc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43729,6 +43729,7 @@
         "minimist": "^1.2.8",
         "mongodb-legacy": "6.1.3",
         "overleaf-editor-core": "*",
+        "p-queue": "^8.1.0",
         "request": "^2.88.2"
       },
       "devDependencies": {
diff --git a/services/project-history/app/js/RedisManager.js b/services/project-history/app/js/RedisManager.js
index fe17508452..2f79a10a91 100644
--- a/services/project-history/app/js/RedisManager.js
+++ b/services/project-history/app/js/RedisManager.js
@@ -298,6 +298,26 @@ async function getFirstOpTimestamp(projectId) {
   return firstOpTimestamp
 }
 
+async function getFirstOpTimestamps(projectIds) {
+  const keys = projectIds.map(projectId =>
+    Keys.projectHistoryFirstOpTimestamp({ project_id: projectId })
+  )
+  const results = await rclient.mget(keys)
+  const timestamps = results.map(result => {
+    // convert stored time back to a numeric timestamp
+    const timestamp = parseInt(result, 10)
+
+    // check for invalid timestamp
+    if (isNaN(timestamp)) {
+      return null
+    }
+
+    // convert numeric timestamp to a date object
+    return new Date(timestamp)
+  })
+  return timestamps
+}
+
 async function clearFirstOpTimestamp(projectId) {
   const key = Keys.projectHistoryFirstOpTimestamp({ project_id: projectId })
   await rclient.del(key)
@@ -357,6 +377,7 @@ const getProjectIdsWithHistoryOpsCountCb = callbackify(
 )
 const setFirstOpTimestampCb = callbackify(setFirstOpTimestamp)
 const getFirstOpTimestampCb = callbackify(getFirstOpTimestamp)
+const getFirstOpTimestampsCb = callbackify(getFirstOpTimestamps)
 const clearFirstOpTimestampCb = callbackify(clearFirstOpTimestamp)
 const getProjectIdsWithFirstOpTimestampsCb = callbackify(
   getProjectIdsWithFirstOpTimestamps
@@ -394,6 +415,7 @@ export {
   getProjectIdsWithHistoryOpsCountCb as getProjectIdsWithHistoryOpsCount,
   setFirstOpTimestampCb as setFirstOpTimestamp,
   getFirstOpTimestampCb as getFirstOpTimestamp,
+  getFirstOpTimestampsCb as getFirstOpTimestamps,
   clearFirstOpTimestampCb as clearFirstOpTimestamp,
   getProjectIdsWithFirstOpTimestampsCb as getProjectIdsWithFirstOpTimestamps,
   clearDanglingFirstOpTimestampCb as clearDanglingFirstOpTimestamp,
@@ -413,6 +435,7 @@ export const promises = {
   getProjectIdsWithHistoryOpsCount,
   setFirstOpTimestamp,
   getFirstOpTimestamp,
+  getFirstOpTimestamps,
   clearFirstOpTimestamp,
   getProjectIdsWithFirstOpTimestamps,
   clearDanglingFirstOpTimestamp,
diff --git a/services/project-history/config/settings.defaults.cjs b/services/project-history/config/settings.defaults.cjs
index 2338718203..9e5a39868a 100644
--- a/services/project-history/config/settings.defaults.cjs
+++ b/services/project-history/config/settings.defaults.cjs
@@ -41,6 +41,9 @@ module.exports = {
         10
       ),
     },
+    project_history: {
+      url: `http://${process.env.PROJECT_HISTORY_HOST || '127.0.0.1'}:3054`,
+    },
   },
   redis: {
     lock: {
diff --git a/services/project-history/package.json b/services/project-history/package.json
index 96cae3d726..2a54a807d3 100644
--- a/services/project-history/package.json
+++ b/services/project-history/package.json
@@ -37,6 +37,7 @@
     "minimist": "^1.2.8",
     "mongodb-legacy": "6.1.3",
     "overleaf-editor-core": "*",
+    "p-queue": "^8.1.0",
     "request": "^2.88.2"
   },
   "devDependencies": {
diff --git a/services/project-history/scripts/flush_old.js b/services/project-history/scripts/flush_old.js
new file mode 100644
index 0000000000..6dc140196e
--- /dev/null
+++ b/services/project-history/scripts/flush_old.js
@@ -0,0 +1,191 @@
+#!/usr/bin/env node
+
+import Settings from '@overleaf/settings'
+import minimist from 'minimist'
+import logger from '@overleaf/logger'
+import PQueue from 'p-queue'
+import * as RedisManager from '../app/js/RedisManager.js'
+import * as ErrorRecorder from '../app/js/ErrorRecorder.js'
+
+logger.logger.level('fatal')
+
+function usage() {
+  console.log(`
+Usage: flush_old.js [options]
+
+Options:
+  -b, --batch-size <size>    Number of projects to process in each batch (default: 100)
+  -a, --max-age <seconds>    Maximum age of projects to keep (default: 3600)
+  -i, --interval <seconds>   Interval to spread the processing over (default: 300)
+  -c, --concurrency <number> Number of concurrent jobs (default: 10)
+  -u, --buffer <seconds>     Buffer time in seconds to reserve at end (default: 15)
+  -n, --dry-run              Show what would be done without making changes
+  -h, --help                 Show this help message
+
+Examples:
+  # Flush projects older than 24 hours with 5 concurrent jobs
+  flush_old.js --batch-size 100 --max-age 86400 -c 5
+
+  # Dry run to see what would be flushed
+  flush_old.js --max-age 3600 --dry-run
+`)
+  process.exit(0)
+}
+
+const argv = minimist(process.argv.slice(2), {
+  boolean: ['dry-run', 'help'],
+  alias: {
+    b: 'batch-size',
+    a: 'max-age',
+    i: 'interval',
+    c: 'concurrency',
+    n: 'dry-run',
+    u: 'buffer',
+    h: 'help',
+  },
+  default: {
+    'batch-size': 100,
+    'max-age': 3600,
+    interval: 300,
+    concurrency: 10,
+    'dry-run': false,
+    buffer: 15,
+    help: false,
+  },
+})
+
+if (argv.help || process.argv.length === 2) {
+  usage()
+}
+
+const batchSize = parseInt(argv['batch-size'], 10)
+const maxAge = argv['max-age'] ? parseInt(argv['max-age'], 10) : null
+const interval = parseInt(argv.interval, 10) || 300
+const concurrency = parseInt(argv.concurrency, 10) || 10
+const bufferTime = parseInt(argv.buffer, 10) || 15
+const dryRun = argv['dry-run']
+
+/**
+ * Generator function that yields batches of items from an array
+ * @param {Array} array - The array to batch
+ * @param {number} size - The size of each batch
+ * @yields {Array} A batch of items
+ */
+function* getBatches(array, size) {
+  for (let i = 0; i < array.length; i += size) {
+    yield array.slice(i, i + size)
+  }
+}
+
+let flushCount = 0
+
+async function flushProject({ projectId, timestamp }) {
+  const url = `${Settings.apis.project_history.url}/project/${projectId}/flush`
+  if (dryRun) {
+    console.log(`[DRY RUN] would flush project ${projectId}`)
+    return
+  }
+  const response = await fetch(url, {
+    method: 'POST',
+  })
+  flushCount++
+  if (flushCount % 100 === 0) {
+    console.log('flushed', flushCount, 'projects, up to', timestamp)
+  }
+  if (!response.ok) {
+    throw new Error(`failed to flush project ${projectId}`)
+  }
+}
+
+const SCRIPT_START_TIME = Date.now() // current time in milliseconds from start of script
+
+function olderThan(maxAge, timestamp) {
+  const age = (SCRIPT_START_TIME - timestamp) / 1000
+  return age > maxAge
+}
+
+async function main() {
+  const projectIds = await RedisManager.promises.getProjectIdsWithHistoryOps()
+  const failedProjects = await ErrorRecorder.promises.getFailedProjects()
+  const failedProjectIds = new Set(failedProjects.map(p => p.project_id))
+
+  const projectIdsToProcess = projectIds.filter(p => !failedProjectIds.has(p))
+  console.log('number of projects with history ops', projectIds.length)
+  console.log(
+    'number of failed projects to exclude',
+    projectIds.length - projectIdsToProcess.length
+  )
+  const collectedProjects = []
+  let nullCount = 0
+  // iterate over the project ids in batches of doing a redis MGET to retrieve the first op timestamps
+  for (const batch of getBatches(projectIdsToProcess, batchSize)) {
+    const timestamps = await RedisManager.promises.getFirstOpTimestamps(batch)
+    const newProjects = batch
+      .map((projectId, idx) => {
+        return { projectId, timestamp: timestamps[idx] }
+      })
+      .filter(({ timestamp }) => {
+        if (!timestamp) {
+          nullCount++
+        }
+        return timestamp ? olderThan(maxAge, timestamp) : true
+      })
+    collectedProjects.push(...newProjects)
+  }
+  // sort the collected projects by ascending timestamp
+  collectedProjects.sort((a, b) => a.timestamp - b.timestamp)
+
+  console.log('number of projects to flush', collectedProjects.length)
+  console.log('number with null timestamps', nullCount)
+
+  const elapsedTime = Math.floor((Date.now() - SCRIPT_START_TIME) / 1000)
+  console.log('elapsed time', elapsedTime, 'seconds, buffer time', bufferTime)
+  const remainingTime = Math.max(interval - elapsedTime - bufferTime, 0)
+  console.log('remaining time', remainingTime, 'seconds')
+
+  const jobsPerSecond = Math.max(
+    Math.ceil(collectedProjects.length / Math.max(remainingTime, 60)),
+    1
+  )
+  console.log('interval', interval, 'seconds')
+  console.log('jobs per second', jobsPerSecond)
+  console.log('concurrency', concurrency)
+
+  const queue = new PQueue({
+    concurrency,
+    interval: 1000,
+    intervalCap: jobsPerSecond,
+  })
+
+  const taskFns = collectedProjects.map(project => {
+    return async () => {
+      try {
+        await flushProject(project)
+        return { status: 'fulfilled', value: project }
+      } catch (error) {
+        return { status: 'rejected', reason: error, project }
+      }
+    }
+  })
+
+  const results = await queue.addAll(taskFns)
+
+  console.log(
+    'finished after',
+    Math.floor((Date.now() - SCRIPT_START_TIME) / 1000),
+    'seconds'
+  )
+  // count the number of successful and failed flushes
+  const success = results.filter(r => r.status === 'fulfilled').length
+  const failed = results.filter(r => r.status === 'rejected').length
+  console.log('completed', { success, failed })
+}
+
+main()
+  .then(() => {
+    process.exit(0)
+  })
+  .catch(err => {
+    console.error(err)
+    process.exit(1)
+  })